As of my last knowledge update in September 2021, Dell is known for producing high-quality gaming laptops under their Alienware and Dell G Series brands. The “best” gaming laptop from Dell can depend on your specific needs, budget, and preferences. Here are some of the top Dell gaming laptops that were available at that time:

1. **Dell Alienware Area-51m R2**:
– This laptop is a beast in terms of gaming performance. It features desktop-grade components, including high-end Intel Core processors and NVIDIA RTX graphics cards.
– The Area-51m R2 offers upgradability for components like the CPU and GPU.
– It features a large, high-refresh-rate display, customizable lighting, and excellent build quality.

2. **Dell Alienware m15 R4**:
– The Alienware m15 R4 is a more portable gaming laptop compared to the Area-51m series.
– It still packs powerful components, including Intel processors and NVIDIA RTX graphics.
– The m15 R4 has a sleek design and offers a high-refresh-rate display for smooth gaming.

3. **Dell G15 Gaming Laptop**:
– The Dell G Series is known for offering gaming performance at a more affordable price point.
– The G15 comes with various configurations, including both Intel and AMD processors, along with NVIDIA GPUs.
– It’s a good option for gamers who want a balance between performance and affordability.

4. **Dell G5 15 SE (Special Edition)**:
– This laptop offers an AMD Ryzen processor and an AMD Radeon graphics card.
– It’s known for delivering good gaming performance at a competitive price.
– The G5 15 SE is also a solid choice for those who prefer AMD processors.

5. **Dell Alienware m17 R4**:
– The Alienware m17 R4 is similar to the m15 R4 but offers a larger 17-inch display.
– It’s a good option for gamers who want a bigger screen for immersive gaming.

6. **Dell Alienware x17**:
– The Alienware x17 is another premium gaming laptop with top-tier components.
– It features Intel processors and NVIDIA RTX graphics, making it a powerhouse for gaming and other demanding tasks.

Please note that the availability and specifications of Dell gaming laptops may have changed since my last update in September 2021. Therefore, I recommend visiting Dell’s official website or consulting recent reviews and recommendations to find the best Dell gaming laptop that suits your needs and budget based on the latest offerings and advancements in gaming laptop technology.